WPF cmd.exe Process closes immediatly

Question

In my WPF application I am trying to open cmd.exe through System.Diagnostics.Process but every time it hits process.Start() it closes immediately and I cannot write anything else to it. However if I call the static Process.Start() it will stay open but then I am unsure how to write to it. See below.

        var processInfo = new ProcessStartInfo("cmd.exe")
        {
            UseShellExecute = false,
            RedirectStandardInput = true,
        };

        var process = new Process()
        {
           StartInfo = processInfo,
        };

        process.Start(); // This close immediately and not work 

        Process.Start("cmd.exe"); // This will work but can't write to it

        process.StandardInput.WriteLine(someText);
        process.StandardInput.WriteLine(moreText);

https://stackoverflow.com/questions/206323/how-to-execute-command-line-in-c-get-std-out-results — kurakura88, May 17 '18 at 01:21

score 1 · Answer 1 · answered May 17 '18 at 07:03

1

Use to wait for cmd.

process.WaitForExit();

answered May 17 '18 at 07:03

Shivani Katukota

859
9
16

inserting this line of code still does not make the code work. – Kishore May 17 '18 at 15:19
Does the app still close immediately for you? – Shivani Katukota May 17 '18 at 15:20
Yes, It does close immediately. – Kishore May 17 '18 at 15:32
Could you post some code as to what you are trying to do.. ideally this statement should wait for your process (here cmd) to close before exiting. – Shivani Katukota May 17 '18 at 15:33
I used the same code as OP posted and incorporated your suggested change, that's all. – Kishore May 17 '18 at 15:37
See if any of the other answers help you. https://stackoverflow.com/questions/3147911/wait-until-a-process-ends?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa – Shivani Katukota May 18 '18 at 07:53

Kishore · Answer 2 · 2018-05-17T15:38:32.577

0

I did some research and found the solution implemented Here works. Not sure if this is the best approach, but it worked for me.

[DllImport("kernel32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool AllocConsole();

private void BtnSubmit_OnClick(object sender, RoutedEventArgs e)
    {
        var processInfo = new ProcessStartInfo("cmd.exe")
        {
            UseShellExecute = false,
            RedirectStandardInput = true
        };

        var process = new Process()
        {
            StartInfo = processInfo,
        };

        AllocConsole();
        process.Start(); // This close immediately and not work 

        process.StandardInput.WriteLine("someText");
        process.StandardInput.WriteLine("moreText");
        process.WaitForExit();
    }

edited May 17 '18 at 15:38

answered May 17 '18 at 15:30

Kishore

653
6
16

So this works well on my Windows 7 laptop but in Windows 10 it does stay up but the directories are blank and whatever I write to it does not show up. – Steve Goldman May 18 '18 at 16:31
Btw - I don't know if this was obvious or not but I did not know. This is only an issue when debugging in Visual Studio. Once you deploy your project and it runs on the .exe file the command prompt window stays up and you can write to it no problem! – Steve Goldman May 18 '18 at 18:43

WPF cmd.exe Process closes immediatly

2 Answers2